Ask him to let you listen. Honestly if you are trying to spy on him or think he is doing something, then you need to talk to him or leave him. Snooping around never helps anything. You will either find something and be upset, or not find anything and not be satisfied and keep trying until you can find the littlest thing. You are just heading down a pad path. You either trust him or you don't. If he has given you reason to not trust him, then leave him. If you are just not a trusting person then don't trust anyone and be by yourself.
